Harry Dunn's mother has urged US presidential candidate Joe Biden to reconsider America’s position on the woman who allegedly caused the teenager's death, if he wins the US election.
Nineteen-year-old Mr Dunn died after being involved in a collision while riding his motorbike near RAF Croughton in Northamptonshire, which is home to a US Air Force communications station.
Motorist Anne Sacoolas' lawyers later admitted she had driven on the "wrong side of the road for 20 seconds" before the incident.
She left the UK, claiming diplomatic immunity and, despite being charged with causing death by dangerous driving, has remained in the US ever since.
All efforts to have her extradited have failed.
In a video message, Harry’s mother Charlotte Charles urges Mr Biden to help her family on the path to recovery, by reversing the decision against extradition, if he becomes the next president.
Earlier this month, UK Transport Secretary Grant Shapps commissioned a review into road safety around US Visiting Forces bases in the UK as a result of Harry’s death.
A US Visiting Forces base is one in the UK which is used by the American military, but remains the property of the British Government.
The Road Safety Foundation will conduct a review of the roads around 10 US Visiting Forces bases in England.